Slovenian firm Vitiva is launching Aquarox 10, a rosemary-derived natural preservative, to extend the shelf-life of prawns.

"We have tested Aquarox on prawns sold in vacuum packs and in brine solutions," said Cohen.

"The results show that utilising the new rosemary formulation in concentration of 0.2 per cent on prawns in storage helps in maintaining their original great taste and colour for up to five days, while sustaining excellent microbiological stability."

Aquarox has been described as an easy-to-apply water-based solution that is rich in rosmarinic acid, a powerful antioxidant said to be stronger than vitamin E.

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